CBW-F310 CBW-F304 CBW-F316 CBW-F320 CBW-F325 Gear Pump 20MPa

Product Overview

The CBW series (CBW-F304 / CBW-F306 / CBW-F310 / CBW-F314 / CBW-F316 / CBW-F320 / CBW-F325) and CBN series (CBN-E304 / CBN-F306 / CBN-G310, etc.) are the two most widely used high-pressure external gear pump platforms in the Chinese hydraulic industry.

The CBW series covers displacements from 4 to 25 cm³/rev, with F-grade pressure rating of 20 MPa continuous and 25 MPa peak. It is widely used in construction equipment, agricultural machinery, and lifting & transport machinery hydraulic systems.

The CBN series offers three pressure grades: E-grade (16 MPa), F-grade (20 MPa), and G-grade (25 MPa), with displacements ranging from 4 to 25 cm³/rev. The CBN-G series reaches 25 MPa, addressing the pressure limitations of earlier CBN-E/F series pumps.

Both series feature precision-ground gears, high-strength aluminum alloy housings, floating bushings, and DU self-lubricating bearings, delivering compact structure, light weight, high efficiency, low noise, and reliable operation.

Every unit is manufactured to original equipment specifications, ensuring 100% drop-in interchangeability with genuine CBW/CBN series pumps without any system modifications. Each pump undergoes rigorous 100% simulated duty-cycle testing to validate pressure-flow-efficiency performance curves.

Brand Disclaimer: This product is a high-quality compatible replacement engineered for full interchangeability with original equipment. All model codes are referenced solely to indicate compatibility and interchangeability. This product is manufactured by an independent producer.

Technical Specifications 

CBW-F300 Series (Gear Module m=3)

• Brand Series: CBW-F300 Series High-Pressure Gear Pump

• Product Type: Fixed Displacement External Gear Pump

• Pressure Grade: F (20 MPa rated, 25 MPa peak)

• Gear Module: m=3

• Housing Material: High-strength aluminum alloy

• Mounting: Flange connection / Threaded connection available

• Shaft Types: Plain key, rectangular spline, woodruff key, SAE spline available

Model-Specific Specifications:

• CBW-F304: 4 ml/r displacement, 20 MPa rated, 25 MPa peak, 800 rpm min, 2500 rpm rated, 3000 rpm max, ≥90% volumetric efficiency, 2.3 kg weight

• CBW-F306: 6 ml/r displacement, 20 MPa rated, 25 MPa peak, ≥91% volumetric efficiency, 2.4 kg weight

• CBW-F310: 10 ml/r displacement, 20 MPa rated, 25 MPa peak, ≥91% volumetric efficiency, 2.6 kg weight

• CBW-F314: 14 ml/r displacement, 20 MPa rated, 25 MPa peak, ≥92% volumetric efficiency, 2.8 kg weight

• CBW-F316: 16 ml/r displacement, 20 MPa rated, 25 MPa peak, ≥92% volumetric efficiency, 2.9 kg weight

• CBW-F320: 20 ml/r displacement, 20 MPa rated, 25 MPa peak, ≥92% volumetric efficiency, 3.1 kg weight

• CBW-F325: 25 ml/r displacement, 20 MPa rated, 25 MPa peak, ≥92% volumetric efficiency, 3.1 kg weight

CBN-E/F/G Series

• Brand Series: CBN-E/F/G Series Gear Pump

• Product Type: Fixed Displacement External Gear Pump

• Pressure Grades: E-grade (16 MPa) / F-grade (20 MPa) / G-grade (25 MPa)

• Gear Module: m=3

• Housing Material: High-strength aluminum alloy

• Rated Speed: 2,000 r/min

• Maximum Speed: 3,000 r/min

Model-Specific Specifications:

CBN-E304 / CBN-F304

• 4 ml/r displacement, 16 MPa (E) / 20 MPa (F) rated, 20 MPa (E) / 25 MPa (F) peak, ≥91% volumetric efficiency

• CBN-G304: 4 ml/r displacement, 25 MPa rated

CBN-E306 / CBN-F306

• 6.3 ml/r displacement, 16 MPa (E) / 20 MPa (F) rated, ≥93% volumetric efficiency

• CBN-G306: 6.3 ml/r displacement, 25 MPa rated

CBN-E308 / CBN-F308

• 8 ml/r displacement, 16 MPa (E) / 20 MPa (F) rated, ≥93% volumetric efficiency

• CBN-G308: 8 ml/r displacement, 25 MPa rated

CBN-E310 / CBN-F310 / CBN-G310

• 10 ml/r displacement, 16 MPa (E) / 20 MPa (F) / 25 MPa (G) rated, ≥95% volumetric efficiency

Additional CBN-E/F Series Models:

• CBN-E/F312: 12.5 ml/r, 16/20 MPa, ≥95% volumetric efficiency

• CBN-E/F314: 14 ml/r, 16/20 MPa, ≥95% volumetric efficiency

• CBN-E/F316: 16 ml/r, 16/20 MPa, ≥95% volumetric efficiency

• CBN-E/F318: 18 ml/r, 16/20 MPa, ≥95% volumetric efficiency, 1500 r/min rated

• CBN-E/F320: 20 ml/r, 16/20 MPa, ≥95% volumetric efficiency, 1500 r/min rated

• CBN-E/F325: 25 ml/r, 16/20 MPa, ≥95% volumetric efficiency, 1500 r/min rated

Key Technical Advantages

1. Axial Clearance Compensation & Radial Hydraulic Balance – High Volumetric Efficiency

Axial clearance automatic compensation and radial hydraulic balance design automatically adjust gear end clearance under high pressure, significantly reducing internal leakage. CBW series volumetric efficiency reaches ≥90%–92%, while CBN series achieves ≥91%–95%, maintaining stable flow output across the full pressure range.

2. High-Strength Aluminum Alloy Housing & DU Self-Lubricating Bearings – Lightweight & Durable

The high-strength aluminum alloy housing delivers lightweight construction with easy installation. DU self-lubricating bearings significantly enhance bearing load capacity and wear resistance. The CBW-F304 weighs only 2.3 kg.

3. Multiple Pressure Grades & Broad Displacement Coverage – Flexible Selection

CBW series offers F-grade (20 MPa) pressure rating, while CBN series provides E (16 MPa), F (20 MPa), and G (25 MPa) three pressure grades. Displacements range from 4 to 25 ml/r—one platform for diverse application requirements.

4. Multiple Interface Standards – 100% Drop-In Interchangeability

Available with flange and threaded port connections, and plain key, rectangular spline, woodruff key, and SAE spline shaft options. Delivers 100% drop-in interchangeability with genuine CBW/CBN series pumps.

5. Broad Speed Range

CBW series supports a wide speed range of 800 – 3,000 r/min, while CBN series operates at 1,500 – 3,000 r/min. Maintains stable flow characteristics from low-speed precision control to high-speed continuous duty.

6. 100% Simulated Duty-Cycle Testing

Every pump is 100% tested on dedicated hydraulic test benches under simulated real-world operating conditions—validating pressure-flow characteristics and efficiency curves at rated pressure and full speed range—ensuring zero-defect, plug-and-play performance upon installation.

Application Areas

• Construction Equipment: Excavators, loaders, bulldozer hydraulic systems

• Agricultural Machinery: Tractors, combine harvesters, implement hitch hydraulic systems

• Lifting & Transport Machinery: Forklifts, lift platforms, crane hydraulic systems

• Mining Machinery: Mining equipment hydraulic systems

• Light Industry Machinery: Industrial equipment hydraulic systems

• Automotive Industry: Vehicle-mounted auxiliary hydraulic systems

Expert Maintenance Tips

1. Fluid Cleanliness Control

Maintain system fluid cleanliness to ISO 4406 19/17/14 or better. Install a 10–25 μm absolute filtration filter upstream of the inlet port to prevent particle contamination from damaging precision gear pairs and DU bearings.

2. Inlet Line Requirements

Keep suction lines short and straight with adequate diameter—not less than the port size. Recommended suction line flow velocity: ≤1.5 m/s to prevent cavitation from excessive inlet resistance. Inlet pressure must be maintained between 0.8–2.0 bar (absolute) .

3. Coupling Alignment Precision

Ensure pump shaft-to-drive shaft coaxiality deviation ≤0.05 mm and angular deviation ≤0.5° during installation. Flexible couplings are strongly recommended. If the drive involves sprockets or V-belt pulleys, an independent outboard bearing MUST be installed to protect the pump shaft.

4. First-Start Priming Procedure

Before initial startup, prime the pump by bleeding air through the drain port or a loosened outlet fitting. Perform 2–3 jog starts with the outlet open (no load) until oil fills the pump cavity without air bubbles, then connect the load circuit for full operation.

5. Rotation Direction Confirmation

CBW/CBN series supports both right-hand (clockwise) and left-hand (counterclockwise) rotation configurations. Always verify that the drive motor/engine rotation matches the pump before installation.

6. Pressure Grade Matching

CBN series E/F/G pressure grades correspond to different operating pressures. Confirm that system working pressure matches the pump’s pressure rating—never exceed rated pressure.